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It seems to have first been published in 2002, though at just over 300 pages it's not exactly thick.
If you look at the connections here and at Amazon you may find some similar books that may include the one you're looking for.
It is in hardcover & paperback. the paperback was published by Bantam in 1998.
If it isn't the book you remember it has very good information on milder forms of depression OCD, & all mental illness.